I am considering addind some mods to my Z. It is leased for 39 months, so I'm not sure if its worth it. I just got it in april, it has 1k miles. I thought of doing a CAI and grounding kit. How much should I expect to pay for a kit? What CAI is better Injen or AEM? What kind of gains are expected with these mod's? Thanks for the advice. I also am considering of a dry nitrous system with a 75-100 shot.

 

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And might I suggest a search. These topics have been covered in depth many times.